H
Helmut Ripperger
Researcher at Leibniz Association
Publications - 48
Citations - 484
Helmut Ripperger is an academic researcher from Leibniz Association. The author has contributed to research in topics: Solasodine & Ene reaction. The author has an hindex of 13, co-authored 48 publications receiving 452 citations. Previous affiliations of Helmut Ripperger include Martin Luther University of Halle-Wittenberg.
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Counlarins, limonoids and an alkaloid from Clausena excavata
TL;DR: Four new coumarins excavatins A–M have been isolated from Clausena excavata and their structures have been assigned by NMR and CD investigations.
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Anguivine and isoanguivine steroid alkaloid glycosides fromSolanum anguivi
Helmut Ripperger,Uwe Himmelreich +1 more
TL;DR: In addition to solamargine, two new steroid alkaloid glycosides, anguivine and isoanguivine, have been isolated from the roots of Solanum anguiva, the structures of which have been elucidated.
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Chalcones and ecdysteroids from Vitex leptobotrys
TL;DR: Three new chalcones have been isolated from aerial parts of Vitex leptobotrys and the structures of which have been identified as 2′,4′-dihydroxy-4,6′-dimethoxychalcone, 4′-hydroxy- 4,2′, 6′-trimeth oxygenchalcone and 4,1′,3′, β -tetrahydroxy
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Damalachawin, a triflavonoid of a new structural type from dragon's blood of Dracaena cinnabari
TL;DR: A triflavonoid, damalachawin, was isolated from dragon's blood of Dracaena cinnabari as mentioned in this paper, and its structure was established mainly by NMR spectroscopy.
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Solanum‐Alkaloide, XX. Konstitution und Stereochemie von Solanocapsin
Klaus Schreiber,Helmut Ripperger +1 more
TL;DR: Solanocapsin wird erstmals zu dem bekannten 3β-Acetoxy-16β-hydroxy-5α-bis-22.23s.25R)-3β-Amino-2.26-imino16β.23-oxido-5β-cholestan-23-ol (VI) vorgeschlagen.